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Alpha;-Actinin-4 Promotes Metastasis in Gastric Cancer

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Alpha;-Actinin-4 Promotes Metastasis in Gastric Cancer Laboratory Investigation (2017) 97, 1084–1094 © 2017 USCAP, Inc All rights reserved 0023-6837/17 α-Actinin-4 promotes metastasis in gastric cancer Xin Liu and Kent-Man Chu Metastasis increases the mortality rate of gastric cancer, which is the third leading cause of cancer-associated deaths worldwide. This study aims to identify the genes promoting metastasis of gastric cancer (GC). A human cell motility PCR array was used to analyze a pair of tumor and non-tumor tissue samples from a patient with stage IV GC (T3N3M1). Expression of the dysregulated genes was then evaluated in GC tissue samples (n = 10) and cell lines (n =6) via qPCR. Expression of α-actinin-4 (ACTN4) was validated in a larger sample size (n = 47) by qPCR, western blot and immunohistochemistry. Knockdown of ACTN4 with specific siRNAs was performed in GC cells, and adhesion assays, transwell invasion assays and migration assays were used to evaluate the function of these cells. Expression of potential targets of ACTN4 were then evaluated by qPCR. Thirty upregulated genes (greater than twofold) were revealed by the PCR array. We focused on ACTN4 because it was upregulated in 6 out of 10 pairs of tissue samples and 5 out of 6 GC cell lines. Further study indicated that ACTN4 was upregulated in 22/32 pairs of tissue samples at stage III & IV (P = 0.0069). Knockdown of ACTN4 in GC cells showed no significant effect on cell proliferation, but significantly increased cell-matrix adhesion, as well as reduced migration and invasion of AGS, MKN7 and NCI-N87 cells. We found that NF-κB was downregulated in GC with the knockdown of ACTN4. In conclusion, this is the first study to indicate that ACTN4 is significantly upregulated in patients with metastatic GC. ACTN4 reduces cell adhesion and enhances migration and invasion of GC cells and may therefore be a novel therapeutic target for GC. Laboratory Investigation (2017) 97, 1084–1094; doi:10.1038/labinvest.2017.28; published online 5 June 2017 Gastric cancer (GC) is the third leading cause of Previous studies have indicated that numerous, complex cancer-associated deaths worldwide.1 Moreover, it has been gene interactions are necessary for metastasis, including predicted that the mortality rate of GC will rise from the 15th vascular endothelium growth factor receptor, matrix metal- to the 10th most common cause of death globally by 2030.2 lopeptidase (MMP), and members of the PI3K-Akt and Wnt- About 70% of the GC cases occur in eastern Asia, with the Notch signaling pathways.13–20 However, the mechanism of highest morbidity in China, Korea, and Japan. In general, the GC metastasis remains unclear; hence, the aim of this study 5-year survival rate for patients at the early stage of GC is was to identify genes promoting metastasis of GC. 490%. However, the chance for survival drops markedly to In this paper, α-actinin-4 (ACTN4) is identified as a key player o25% for advanced stage disease with metastasis.3,4 The in GC metastasis. ACTN4 is a member of the α-actinin family, preferred sites of metastatic GC include lymph nodes, liver which belongs to the spectrin superfamily proteins. There are and peritoneum.5,6 four isoforms of α-actinin, and isoform 4 is 'non-muscle' Metastasis of cancer cells is a complex, multi-step process. α-actinin. It predominantly localizes in the cytoplasmic region,21 Generally, it involves cancer cells acquiring the capability to and has multiple roles in non-muscle cells, including cellular invade and disseminate from their original location. These protrusion, cell adhesion, and cellular motility.22,23 Functionally, cells survive in circulation and colonize in secondary organs at α-actinin is associated with microfilament bundles and tight which they form new tumors.7 Numerous genes have junctions, where it is involved in cross-linking actin filaments and important roles in these processes. For example, genes for connecting actin to the cell membrane. Actinin is a component chemotaxis and growth factors contribute to invasion.8,9 of the stress fiber and structural protein,24 and the overexpression Genes for cell adhesion, protrusion, or movement lead to of ACTN4 contributes to metastasis and/or chemoresistance in intravasation and migration.10 Genes encoding receptors and lung cancer, ovarian cancer, and colorectal cancer.25–27 As a proteases are involved in extravasation.11,12 result, we proposed that ACTN4 is a key factor in GC metastasis. Department of Surgery, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong Correspondence: Professor K-M Chu, MBBS, MSc, FRCS (Edin), FACS, FCSHK, FHKAM (Surgery), Department of Surgery, The University of Hong Kong, Queen Mary Hospital, Pokfulam 000, Hong Kong. E-mail: [email protected] Received 5 April 2016; revised 8 December 2016; accepted 16 January 2017 1084 Laboratory Investigation | Volume 97 September 2017 | www.laboratoryinvestigation.org α-Actinin-4 in gastric cancer X Liu and K-M Chu MATERIALS AND METHODS SYBR Green PCR Kit (Qiagen). Specific primers for qPCR Human Tissue Samples were provided by IDT (Singapore). QPCR was performed in Forty-seven pairs of human GC and non-tumor tissue ABI ViiA7 Real-time PCR system (Applied Biosystems, samples were collected directly after surgical resection at Waltham, MA, USA). The primers sequences are listed in Queen Mary Hospital, Hong Kong. All of the tumor tissue supplementary Table 1. The expression of mRNAs was − ΔΔ samples were validated as malignant by an experienced normalized to GAPDH using the 2 Ct method. The ΔCt pathologist. All of the samples were obtained with the was calculated by subtracting the Ct values of GAPDH from participants’ informed consent and none of the patients the Ct values of targets. The ΔΔCt was then calculated by received preoperative treatment. All samples were immedi- subtracting ΔCt of non-tumor sample from ΔCt of the paired ately frozen in liquid nitrogen and stored at − 80 °C. tumor sample. Fold changes in the targets were calculated by − ΔΔ the equation 2 Ct. Cell Lines and Cell Culture Human GC cell lines including AGS, NCI-N87 (ATCC, Western Blots Rockville, MD, USA), MKN7, MKN45 (Riken, Japan) and Cells were harvested and lysed by RIPA Buffer (Sigma BGC823, PAM82 (given by Beijing Institute of Cancer Chemical, St Louis, MD, USA). Samples containing equal Research, China) were used in this study. Cells were cultivated amounts of protein were separated by SDS-PAGE and in RPMI 1640 medium (Gibco BRL, Gaithersburg, MD, USA) electroblotted onto Immobilon-P Transfer Membrane supplemented with 10% heat-inactivated fetal bovine serum (Applied Biosystems). The membrane was blocked with 5% (FBS) (Gibco BRL, Grand Island, NY, USA). All cells were non-fat milk, followed by incubation with antibodies specific incubated at 37 °C in a humidified incubator which contains for anti-ACTN4 (1:1000, Abcam, Cambridge, UK) and anti- 5% CO2. β-actin (1:10 000, Cell Signaling Technology, Beverly, MA, USA), respectively. Blots were then incubated with goat anti- Rna Extraction in Tissue Samples and Cell Lines rabbit or anti-mouse secondary antibody conjugated to About 20 mg of each tissue sample or 106 cells of each cell line horseradish peroxidase (Amersham Pharmacia, Cleveland, were used for RNA extraction via RNeasy Mini Kit (Qiagen, OH, USA) accordingly. The signals were captured by FUJI Hilden, Germany) according to the manufacturer’s instruc- Medical X-Ray Film (Fuji, Japan) and developed by the FUJI tions. The concentrations of all RNA samples were quantified system. by NanoDrop 1000 (Nanodrop, Wilmington, DE, USA). From each sample, 500 ng of total RNA were utilized for Immunohistochemistry reverse transcription (RT). Tissue sections were obtained from tumor and non-tumor segment of patients with GC. Consecutive paraffin-embedded Rt2 Profilertm PCR Array for Human Cell Motility tissue sections of 5 μm were dewaxed and dehydrated. The A pair of tumor and non-tumor tissue samples from a patient slides were incubated at 50 °C overnight, then soaked in with GC (stage IV with metastasis, T3N3M1) was used for the xylene for 10 min three times, and immersed in 100% ethanol PCR array. Total RNA was extracted as prescribed above and for 5 min, 95% ethanol for 5 min, and 80 and 70% ethanol for reverse-transcribed using RT2 First Strand Kit (Qiagen). The 1 min. After rehydration for 5 min, the slides were boiled in cDNAs was used for the PCR array using RT2 SYBR Green citrate buffer (pH 6.1, Target Retrieval Solution; Sigma, CA, qPCR Mastermixes (Qiagen). This profiler is a pathway- USA) for 25 min, rinsed with 1 × PBS for 5 min, and treated focused gene expression analysis. It contains 84 genes with 3% hydrogen peroxide for 10 min. After that, slides were involved in cell movement, including cell adhesion, cellular placed flat on the bench top and sections were covered in a projection, chemotaxis, proteases, and their inhibitors. By solution of rabbit antibody to ACTN4 (1:100 dilution; comparing gene profiles between tumor and non-tumor Abcam) at room temperature for 30 min and then covered tissue samples, different gene expression profiles were with a solution of goat anti-rabbit (1:500) (Dako) for 30 min, established. Upregulation of the genes (greater than twofold) and finally in a solution of streptavidin–horseradish perox- in tumor samples compared with non-tumor samples after idase (LSAB2 System; Dako) for 30 min. Color was with the normalization were chosen for further study. Substrate—Chromogen Solution (LSAB2 System; Dako) for 5 min, and counter-stained with Mayer hematoxylin (Merck, RT Quantitative PCR (qPCR) Darmstadt, Germany) for 1 min. Finally, the slides were SYBR green RT quantitative PCR (RT qPCR) assay was used dehydrated in 50, 75, and 100% ethanol for 5 min each, and for mRNA quantification in tissue samples and cells.
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